perf: cache block-level constants in executeEVMTxWithGigaExecutor

[pdrobnjak]

Summary

• Cache block-constant EVM values (ChainID, BlockContext, ChainConfig, BaseFee) once per block, eliminating redundant store reads, Keccak256 hashing, and big.Int allocations per transaction
• These values are identical for every tx in a block but were recomputed on every call to executeEVMTxWithGigaExecutor
• Cache is populated in both giga execution paths:
  • ProcessTxsSynchronousGiga — sequential path (non-OCC)
  • ProcessTXsWithOCCGiga — parallel OCC path

Allocation reduction (heap diff, alloc_space)

Function	Reduction
GetVMBlockContext	-6.17 GB
VersionIndexedStore.UpdateReadSet	-2.56 GB
VersionIndexedStore.Get	-2.88 GB
Dec.UnmarshalJSON (params)	-3.08 GB
json.Unmarshal (params)	-2.13 GB
gaskv.NewStore	-1.50 GB
Total	~11.3 GB fewer allocs

TPS is roughly flat — the win is in reduced GC pressure from eliminating ~11 GB of redundant allocations per 300s run.

Test plan

• go build ./app/... compiles cleanly
• gofmt -s -l app/app.go produces no output
• Benchmark comparison: both baseline and candidate complete 300s runs
• Profile diff confirms allocation reductions in target functions
• CI passes

🤖 Generated with Claude Code

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Feb 27, 2026, 3:41 PM

[codecov]

Codecov Report

❌ Patch coverage is 65.00000% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.71%. Comparing base (7cfe94a) to head (25d74fc).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
app/app.go	65.00%	15 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2899      +/-   ##
==========================================
- Coverage   58.12%   52.71%   -5.41%     
==========================================
  Files        2111     2049      -62     
  Lines      173544   163882    -9662     
==========================================
- Hits       100879    86397   -14482     
- Misses      63706    69286    +5580     
+ Partials     8959     8199     -760     

Flag	Coverage Δ
sei-chain-pr	49.40% <0.00%> (?)
sei-db	69.50% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
app/app.go	69.91% <65.00%> (-1.54%)	⬇️

... and 606 files with indirect coverage changes

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